D11991: Fix warning

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  .../qml/QtQuick/Controls.2/org.kde.desktop/ToolBar.qml:37: ReferenceError: is is not defined

TEST PLAN
  Now Discover still works, I'm not sure how to test it specificly. It
  doesn't look like it was doing anything before though.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11991

AFFECTED FILES
  org.kde.desktop/ToolBar.qml

To: apol, #kirigami
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, davidedmundson, mart, hein
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